Up for auction is an ORIGINAL DELCO N.O.S. FAN part #15-877 Gr. 8.857 3037551 This was only opened to take pics and includes installation instruction sheet and just squirrel cage fan. Diameter is 5 3/4" x 3 5/8 depth. This will fit many GM vehicles so please be sure this is what you need, take a look at pics and decide Good Luck bidding.